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Extra info for 4-Manifolds which embed in R5 R6, and Seifert manifolds for fibered knots

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5 Nails, Screws, Bolts, and Other Fasteners 15 Figure 1-13 To prevent a nail from splitting wood, a pilot hole is sometimes drilled. Pilot-hole drilling is common when using screws. ) against it (see Figure 1-13). In addition, in fine work, where a large number of nails must be driven, such as applying cedar clapboards, holes should be drilled. This step prevents crushing the wood and possible splitting because of the large number of nails driven through each board. The size of drill for a given size nail should be slightly smaller than the shank diameter.

The common machine bolt has a square or hexagonal head. The carriage bolt has a round head; the stove bolt has a round or countersunk head with a single slot. Lock washers are used to prevent nuts from loosening. Other fasteners are the toggle, Molly, and expansion bolt. Review Questions 1. What is nail holding power? 2. Explain the penny nail system. 3. What should be considered when selecting a nail for a partic- ular job? 4. Name and describe five kinds of useful nails. 5. Name the three basic head shapes of wood screws.

Wood as a Building Material 43 ANNUAL RINGS MEDULLARY RAYS LONG FIBER MEDULLARY FIBERS Figure 2-2 A piece of wood magnified to show its structure. The wood is made up of long, slender cells called fibers, which usually lie parallel to the pith. The length of these cells is often 100 times their diameter. Transversely, bands of other cells, elongated but much shorter, serve to carry sap and nutrients across the trunk radially. In addition, in the hardwoods, long vessels or tubes (often several feet long) carry liquids up the tree.

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